The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
"One of the courses of 'Lectures to working men ̓which have been given by the professors of the Royal School of Mines and the Royal College of Science annually for the last five-and-thirty years."--Pref
"Important events arranged in chronological order": p. 267-270